private void btnLast_Click(object sender, EventArgs e)
        {
            FormSession session = new FormSession(Settings.GetSetting("LAST_SAVE"));

            session.FormClosed += (x, y) => { Close(); };       //Quickcast to close main Form after user closes the session
            Hide();
            session.ShowDialog();
        }
        private void btnCreate_Click(object sender, EventArgs e)
        {
            FormSession session = new FormSession(string.Empty);

            session.FormClosed += (x, y) => { Close(); };       //Quickcast to close main Form after user closes the session
            Hide();
            session.ShowDialog();
        }
        private void btnOpen_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog()
            {
                Filter = "Session ChartData|*session", DefaultExt = "session", Title = "Open Session"
            };

            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                FormSession session = new FormSession(openFileDialog.FileName);
                session.FormClosed += (x, y) => { Close(); };       //Quickcast to close main Form after user closes the session
                Hide();
                session.ShowDialog();
            }
            else
            {
                MessageBox.Show("You haven't chosen valid file!");
                //Maybe return new invocation of this method?
            }
        }